Screen Capture

Of course the Mac's built in command-shift-3 and command-shift-4 is satisfactory for most snap shots but if you need something more
or have a particularly tricky screen to capture, one of these programs might help.

Constrictor is a screen snapshot utility for Mac OS X 10.7 and up. It
provides you with a moveable, resizeable frame that floats over all your
other windows. Here's Constrictor ready to take a snapshot of an icon on
the desktop:

DVD Snap allows you to capture photos from any movie running in Apple's
DVD Player.
Pick any scene you want and DVD Snap either snaps a single photo or
series of timed snaps in an interval of your choice.
All your captured photos are automatically taken to DVD Snap's photo
library where you can share or export them to a destination folder of
your choice in various formats.

When called upon, FlySketch will show its main drawing window above all
other windows in the system. Change the transparency of the canvas, and
you can trace, draw over, highlight, and capture just about anything
that shows up behind FlySketch.
Capture a web page and highlight important bits. Send it off in an email.
Some app's just can't draw. Let FlySketch do it for them.

InstantShot! offers classical screenshot functionality for capturing the
whole screen, a portion of it or a window and also the option to make
timed screenshots or to make delayed captures over time. It offers a
wide range of preferences and options to fit everyone's needs.

Welcome to realtime screen recording like you've never seen before!
iShowU Instant is the fastest, most feature filled realtime screen
capture tool from shinywhitebox yet. It takes key features from both
"Classic" and HD Pro, and merges them into a single product, making
'Instant' the only app you'll ever need to create recordings quickly.
All of the features you would expect are here, and probably some you
don't! Record from any screen, enhance your microphone audio through the
use of a dynamics processor, compressor and/or equaliser*, add text
and/or an overlay, enhance your recording with mouse and click
visualization, trim front/back after recording, create time-lapse
recordings, share to a wide range of online services, and more.

Screenflick is a screen recorder for macOS focused on providing high
performance and reliable audio and video screen capture. Used by
consumers and professionals around the world, whether you're recording a
software training session, video chats, demo of your app or website, a
play session of the latest 3d game, or anything at all that's on your
screen, Screenflick is the tool to use.

Record exactly what you see on the screen and turn it into a screencast
in next to no time. Screenium lets you record at 60 frames per second,
offering optimum performance for your tutorials, gameplay recordings or
any other screen content you wish to record. Not only If you work with
an ultra-high resolution 4K or 5K display or a Retina Mac, Screenium
puts you on the safe side as it creates the smoothest video quality
possible for these types of devices. Screenium offers three different
recording modes: Record full screen, individual windows, or any selected
area.

Simple, Powerful Screen Capture Software and Screen Recorder
Take a screenshot or capture a video of what you see on your computer
screen. Choose whether you want to capture an image or record your
screen after you make your selection, and resize the capture area right
down to the pixel.
Snagit is way more than just a snipping tool. Customize and edit every
screenshot with professional-quality markup tools. Trim any part of your
recordings. Or convert videos to an animated GIF.

Now compatible with Sierra!
Snapz Pro X allows you to effortlessly record anything on your screen
(Except DRM-protected content), saving it as a QuickTime® movie or
screenshot that can be emailed, put up on the web, or passed around
however you want. This version has been rewritten from the ground up
with the most modern APIs to take maximum advantage of Mac OS X 10.8.0
or later. It is Retina Display compatible!